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The restrictive screen (see Figure 39) and the air intake
piping should be secured in place with a screw. To prevent
damage to the equipment, first position the restrictive
screen in place, then drill a pilot hole suitable for the screw
being used. The screen must be fully seated and the screw
should not interfere with the airflow through it. Once the
pilot hole is drilled, place the intake pipe in position and
secure in place using the screw (see Figure 45 through
Figure 47). Do not use glue to secure this joint in order to
allow the screen to be removed for cleaning. The screen
in the exhaust piping should be located close to the blower
and all exhaust piping joints should be glued.
If the installation requires restrictive screens (see
Figure 39) the restrictive screens should be installed near
the blower as shown in Figure 45 through Figure 47. If
the restrictive screens are installed near the blower, it
is recommended that debris screens (see Figure 39) be
installed at the terminations.
CONDENSATE (EXHAUST)
In certain conditions, installations in unconditioned
space or having long horizontal or vertical vent runs can
accumulate condensate. Long lengths of venting that pass
through cool/cold areas will experience condensation. The
vent pipe should be sloped upwards away from the blower
assembly, then adequate means for draining and disposing
of the condensate needs to be made by the installer.
Condensate formation does not occur in all installations of
power direct vented water heaters, but should be drained
on installations where it can form in the venting system.
Condensation in the venting system of power direct vented
water heaters is dependent upon installation conditions
including, but not limited to:
•
ambient temperature and humidity of installation
location,
•
ambient temperature and humidity of venting space,
•
vent discharge and slope,
•
product usage.
If installation conditions cause condensation, install a
condensate trap loop approximately 8" in diameter using
3/8" plastic hose. Connect the hose to the built-in drain
port of the rubber coupling of the blower assembly (see
Figure 48). Loop the hose in a vertical position as shown.
The tube loop must be filled with water at least halfway
prior to operating the heater. Ensure the end of the tube
has access to a drain as condensate will flow from the end.
Secure the tubing to the side of the heater. Caution must
be used to ensure that drain is free and clear of debris and
will not allow backflow through the condensate drain line.
Care should be taken to ensure there is no kink or twist
in the condensate hose.
•
Condensate lines must be free and clear of debris and
must not allow back flow through drain line.
•
Condensate lines must be able to flow freely to an
appropriate drain.
•
Do not allow condensate lines to become crimped
closed.
42
•
Analyze entire vent system to make sure that
condensate will not become trapped in a section of
vent pipe and therefore reduce open cross sectional
area of vent.
Condensate from this water heater is mildly acidic. Please
note that some local codes require that condensate be
treated by using a pH neutralizing filter prior to disposal.
Condensate neutralizer kits are available. Contact your
distributor or Service Agency.
Prior to operating the water heater, make sure the
removable cap is installed on the drain port in installations
where a drain hose is not needed. Note: This cap must
remain in place if a drain hose is not installed.
CONDENSATE (INTAKE)
The air intake piping in a direct vent system will normally
not have any moisture accumulation in it. However, in
certain cases, moisture may build up and needs to be
drained. Typical situations include, but are not limited to:
•
cold outdoor temperature, particularly if the air inlet
is short,
•
high outdoor humidity,
•
heater being used mostly for space heating and
•
air inlet pipe has vertical rise near the heater.
Installations with any of these conditions are required to
provide a moisture drain with a trap that flows to a waste
drain (see Figure 48). A horizontal section of the air inlet
pipe, near the heater should include a suitable tee and a
hose barb fitting to drain the water. The tee should be as
close to the heater as is practical. Install a condensate trap
loop approximately 8" in diameter using 3/8" plastic hose.
Connect the hose to the tee. Loop the hose in a vertical
position as shown Figure 48 and flow to an appropriate
waste drain. The air intake drain line must be entirely
separate from the exhaust vent outlet condensate line.
HOSE CONNECTION
PORT FOR
CONDENSATE
DRAIN
www. lochinvar .com
8"
CONDENSATE
LOOP
(INTAKE)
BLOWER
ASSEMBLY
8"
CONDENSATE
LOOP
(EXHAUST)
TO DRAIN
Figure 48.
100304522_2000545236 _Rev. 02
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